Fix crash when calling chrome.tabs.move({index:-1}).

chrome/test/data/extensions/api_test/tabs/basics/move.html

Index: chrome/test/data/extensions/api_test/tabs/basics/move.html
diff --git a/chrome/test/data/extensions/api_test/tabs/basics/move.html b/chrome/test/data/extensions/api_test/tabs/basics/move.html
index 9df94f4ae7e74c8b6192e24fac1ea07835ed8bbb..55eb71b1e23cb8c82e7936efa0f8b1d6d7a150d4 100644
--- a/chrome/test/data/extensions/api_test/tabs/basics/move.html
+++ b/chrome/test/data/extensions/api_test/tabs/basics/move.html
@@ -80,6 +80,22 @@ chrome.test.runTests([
         assertEq("chrome://newtab/", tabs[1].url);
       }));
     }));
+  },
+
+  // Make sure we don't crash when the index is out of range.
+  function moveToInvalidTab() {
+    var error_msg = "Invalid value for argument 2. Property 'index': " +
+        "Value must not be less than 0.";
+    try {
+      chrome.tabs.move(moveTabIds['b'], {index: -1}, function(tab) {
+        chrome.test.fail("Moved a tab to an invalid index");
+      });
+    } catch (e) {
+      assertEq(error_msg, e.message);
+    }
+    chrome.tabs.move(moveTabIds['b'], {index: 10000}, pass(function(tabB) {
+      assertEq(1, tabB.index);
+    }));
   }
 ]);
 </script>